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B5 DECU thrust hard fault. With REV light,
Unable to start in Primary or
Reversionary
N/A Abort Mission
TM 1-1520-240-10
2-3-13
Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix (Continued)
DECU Fault
Code(s) Fault Operational Effect Pilot Action Mission Impact
B6 DECU ECL soft fault. N/A N/A Abort Mission
B7 DECU PLA hard/soft fault. With or without REV light
Unable to start in Primary or
Reversionary
N/A Abort Mission
B9 DECU cold junction compensation
(CJCV) soft
fault.
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
BA DECU internal soft fault. N/A N/A Continue Mission
BB DECU internal soft fault. N/A N/A Continue Mission
BC DECU 400 Hz hard/soft
fault.
With or without REV light N/A Abort Mission
C1 DECU communication soft
fault.
N/A N/A Continue Mission
C2 DECU communication soft
fault.
N/A N/A Continue Mission
C3 DECU communication soft
fault.
N/A N/A Continue Mission
C4 DECU communication soft
fault.
Unable to TQ share Switch to PTIT
sharing
Continue Mission
C5 DECU communication soft
fault.
N/A N/A Continue Mission
C6 DECU communication soft
fault.
N/A N/A Continue Mission
C7 DECU communication soft
fault.
N/A N/A Continue Mission
More than
two codes,
C1 through
C7
DECU communication link
redundancy failure.
N/A N/A Abort Mission
C8 DECU communication link
failure.
N/A N/A Abort Mission
C9 DECU N1 from the other
engine fails.
Unable to N1 load share N/A Continue Mission
CF DECU load share hard
fault.
FADEC light
Primary mode failed
N/A Abort Mission
D0 DECU overspeed system
soft fault.
Overspeed system compromised
N/A Continue Mission
D1 DECU P3 sensor soft
fault.
Loss of surge protection N/A Abort Mission
D2 DECU P1 sensor hard
fault.
With FADEC light N/A Abort Mission
D2 DECU P1 sensor soft
fault.
Without FADEC light N/A Continue Mission
D3 DECU internal soft fault. N/A N/A Continue Mission
TM 1-1520-240-10
2-3-14
Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix (Continued)
DECU Fault
Code(s) Fault Operational Effect Pilot Action Mission Impact
D4 DECU internal power supply
hard fault.
FADEC light
Unable to start in Primary
N/A Abort Mission
D5 DECU internal power supply
hard fault. DECU internal
hard fault.
FADEC light
Unable to start in Primary
N/A Abort Mission
D6 DECU internal hard fault. REV light
Overspeed system compromised
Unable to start in Primary and
Reversionary
N/A Abort Mission
D6 DECU internal soft fault. Without REV light N/A Continue Mission
D7 DECU internal power supply
hard fault.
FADEC light
Unable to start in Primary
N/A Abort Mission
D8 DECU internal soft fault N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
D9 DECU internal soft fault. N/A N/A Continue Mission
DA DECU internal power supply
hard/soft fault.
With or without REV light
May be unable to start in Primary
and Reversionary
N/A Abort Mission
DB DECU Reversionary system
hard/soft fault.
With or without REV light
May be unable to start in Primary
and Reversionary
N/A Abort Mission
DC DECU internal PTIT soft
fault.
N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
DD DECU overspeed system
soft fault.
N/A N/A Continue Mission
DE DECU 400 HZ hard/soft
fault.
With or without REV light
May be unable to start in Primary
and Reversionary
N/A Abort Mission
DF DECU internal hard fault. FADEC light
Unable to start in Primary
N/A Abort Mission
E1
(DECU Prestart
BIT
check)
DECU PTIT soft fault. N/A Perform REV
mode selected
start. Switch to
PRI when ground
idle is achieved.
Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
E1
(All other
DECU BIT
checks)
DECU PTIT soft fault. N/A Make an entry on
the DA Form
2408-13-1 even if
fault code clears.
Continue Mission
TM 1-1520-240-10
2-3-15
Table 2-3-1. T55-GA-714A DECU BIT Fault Code List/Matrix (Continued)
DECU Fault
Code(s) Fault Operational Effect Pilot Action Mission Impact
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